WO2002065596A2 - Method and system for cooling a laser gain medium - Google Patents
Method and system for cooling a laser gain medium Download PDFInfo
- Publication number
- WO2002065596A2 WO2002065596A2 PCT/US2002/001061 US0201061W WO02065596A2 WO 2002065596 A2 WO2002065596 A2 WO 2002065596A2 US 0201061 W US0201061 W US 0201061W WO 02065596 A2 WO02065596 A2 WO 02065596A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- gain medium
- heat sink
- fluid
- cooling
- layer
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/042—Arrangements for thermal management for solid state lasers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/0602—Crystal lasers or glass lasers
- H01S3/0604—Crystal lasers or glass lasers in the form of a plate or disc
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/02—Constructional details
- H01S3/04—Arrangements for thermal management
- H01S3/0407—Liquid cooling, e.g. by water
Definitions
- the present invention relates to methods and systems for cooling a laser gain medium.
- laser systems aim to achieve high output power while maintaining high beam quality.
- inefficiencies in laser systems cause heating of the gain medium. Thermal effects resulting from this heating can adversely affect the beam quality, particularly at high power.
- Thermal effects commonly found in lasers having solid state gain media include distortion, fracture and thermal lensing of the gain medium.
- the optically pumped gain medium is typically pumped throughout its volume but cooled only on the surface.
- the gain medium expands due to an increase in temperature resulting from the portion of the pumping power which is dissipated as heat in the gain medium. This causes the optical surfaces of the gain medium to distort and become stressed. Thermally induced stress exceeding the rupture strength of the gain medium material causes the gain medium to fracture.
- Thermal lensing results from changes in the index of refraction of the gain medium due to thermal gradients and stresses.
- this thermal lensing causes the gain medium to act as a lens whose focal length is inversely proportional to the amount of heat dissipated in the gain medium. As a result of the thermal lensing the beam quality is degraded.
- Some solid state lasers are designed to operate at a single operating power so that constant pumping power and constant temperatures gradients are maintained thereby stabilizing thermally-induced effects to the laser gain medium.
- the advantage of disc or thin plate laser systems is that the gain medium can be pumped at a high pumping power since the heat resulting thereby can be transferred to a solid cooling element via a cooling surface at one or both surfaces of the disc.
- the temperature gradient formed in the gain medium does not have a negative effect on the beam quality of the laser radiation field at high pumping power since the laser radiation field propagates approximately parallel to the temperature gradient in the gain medium so the temperature gradient is constant across the laser beam cross-section.
- the use of a surface-cooled disc or thin plate laser material geometry can in principle result in reduced thermal lens distortion, thus, good beam quality at high output power can be achieved.
- solid state laser assemblies including disc, slab, and rod type laser mediums
- solid state laser assemblies continue to be hampered by thermal effects when pumped at broad power ranges (i.e. from low to high power).
- solid heat sinks can provide more efficient heat removal than flowing water, this efficiency is dependent on good thermal contact between the heat sink and the gam medium.
- U.S. Patent No. 5,848,081 discloses an insulating barrier between the laser medium and the bulk of the cooling fluid flow in order to operate the gain medium at an elevated temperature.
- the small gap between the insulator and the gain medium is filled with the cooling fluid. This guarantees good thermal contact between the insulator and the gain medium.
- the purpose of the insulator is to operate the gain medium at a temperature significantly higher than that of the cooling fluid used to cool the insulator.
- U.S. Patent No. 5,696,783 discloses a cooling system wherein the bulk of the heat is removed by cooling fluid via forced convection. In this patent, the heat is carried away by the cooling fluid.
- a method for cooling a laser gain medium having a thermal conductivity includes positioning a heat sink made of a material with a thermal conductivity greater than the thermal conductivity of the gain medium adjacent the gain medium. The method further includes fluidly conducting heat from the gain medium to the heat sink to cool the gain medium.
- the step of fluidly conducting may include the step of providing a fluid layer having a relatively low thermal resistance in thermal contact with both the gain medium and the heat sink so that most of the heat removed from the gain medium is removed by conduction through the fluid layer and into the heat sink.
- the fluid layer may be static or nearly static.
- the heat sink may be a solid heat sink.
- the gain medium may be a solid state gain medium such as a thin disk laser crystal.
- the fluid layer may also be a layer of water, or may be a metal liquid at or near room temperature such as mercury, gallium or a gallium alloy.
- the method may further include cooling the heat sink by forced convection such as with a cooling fluid.
- the step of cooling the heat sink by forced convection may further include the step of cooling the heat sink by forced convection with a fluid that is the same as the fluid of the fluid layer, or with a fluid that is different than the fluid of the fluid layer.
- a system for cooling a laser gain medium having a thermal conductivity includes a heat sink made of a material with a thermal conductivity greater than the thermal conductivity of the gain medium positioned adjacent the gain medium.
- the system also includes a fluid conductor for conducting heat from the gain medium to the heat sink to cool the gain medium.
- the fluid conductor may be a fluid layer having a relatively low thermal resistance in thermal contact with both the gain medium and the heat sink so that most of the heat removed from the gain medium is removed by conduction through the fluid layer and into the heat sink.
- the fluid layer may be static or nearly static.
- the heat sink may be a solid heat sink.
- the gain medium may be a solid state gain medium such as a thin disk laser crystal.
- the fluid layer may further be a layer of water, or may be a metal liquid at or near room temperature, such as mercury, gallium or a gallium alloy.
- the system may further include a cooling subsystem for cooling the heat sink by forced convection such as with a cooling fluid.
- the cooling subsystem may include a source of fluid that is the same as the fluid of the fluid layer, or that is different than the fluid of the fluid layer.
- Thermal resistance combines the thermal conductivity of the liquid and the thickness of the liquid layer into a single parameter.
- a very thin layer of a poor thermal conductivity liquid could have a thermal resistance as low as a thicker layer of a higher thermal conductivity liquid.
- Thermal conductivity (k) is measured in W/cm°C.
- the units of thermal resistance are °C/W.
- the fluid layer is a relatively thin fluid layer having a good thermal conductivity.
- FIGURE 1 is a schematic view of a disc laser cooling assembly for a disc type laser according to an embodiment of the present invention
- FIGURE 2 is a sectional view of the disc laser cooling assembly of the present invention
- FIGURE 3 is a sectional view of a cooling assembly for an end pumped rod laser according to an embodiment of the present invention
- FIGURE 4 is a sectional view of a disc laser cooling assembly illustrating flowing liquid according to an embodiment of the present invention.
- Figure 1 illustrates a disc laser cooling assembly generally indicated at 10 according to an embodiment of the present invention to provide improved surface cooling of a solid state laser disc 12 having a gain medium such as Nd: YAG or Yb:YAG.
- a heat sink body 22 made of suitable thermally conductive material (s) and a holding body 18 made from a suitable optically transparent material, such as glass, fused silica, or sapphire.
- the disc 12 is attached to the holding body 18 preferably via a diffusion bond to prevent curvature distortion of the disc 12.
- the holding body 18 may have an aperture 19 as shown in Figure 2 disposed over the disc 12 such that the holding body 18 does not cover the entire surface of the disc 12.
- Thermally conductive materials include metals such as copper, brass, aluminum, nickel, and alloys thereof; other materials such as diamond and silicon carbide; and gold or nickel-coated versions of these materials.
- a heat sink side 16 of the disc 12 includes a reflector layer 26.
- the reflector layer 26 is preferably highly reflecting at both the laser and pump wavelengths.
- An output side 28 of the disc 12 includes an optional anti-reflective coating 32. If the refractive index of the disc 12 is close to that of the holding body 18 (i.e. difference of less than 0.2) then reflection at the interface is negligible and the anti-reflective coating 32 may not be necessary.
- a laser radiation field 40 is formed between an output coupling mirror 42, which generates a laser output beam 36, and the disc 12.
- the laser radiation field 40 enters the disc 12 and is reflected by the reflector layer 26.
- the disc 12 is also penetrated by pumping light 46 from pumping light radiation source(s) 48.
- the pumping light 46 leads to an excitation of the disc 12, in particular in the region thereof penetrated by the laser radiation field 40.
- the thermal conductivity of the heat sink 22 is greater than that of the disc 12 so that more efficient heat conduction takes place in the heat sink 22 than in the disc 12.
- a temperature gradient results in the disc 12 that is parallel to a direction of propagation 38 of the laser radiation field 40. Face cooling of the disc 12 minimizes temperature gradients perpendicular to the direction of propagation 38 of the laser beam that could create thermal lensing.
- the disc 12 When pumped throughout its volume but cooled only on one face, the disc 12 will distort due to the thermal gradients within the disc 12.
- the distortion can consist of both curvature and bulging of the disc 12. If the disc 12 relied on physical contact or a rigid bond with the heat sink for cooling, this distortion could reduce the thermal contact between the disc 12 and the heat sink 22, thereby reducing the cooling effectiveness of the heat sink 22 thereby degrading the laser beam quality and risking fracture of the disc 12.
- a cavity 14 Separating the disc 12 from the heat sink 22 is a cavity 14 in which a high thermal conductivity liquid (e.g. , mercury or a mercury substitute such as liquid gallium or a gallium alloy as disclosed in U.S. Patent No. 5,792,236) is placed to serve as a heat conductor between the disc 12 and the heat sink 22.
- a high thermal conductivity liquid e.g. , mercury or a mercury substitute such as liquid gallium or a gallium alloy as disclosed in U.S. Patent No. 5,792,236
- the presence of the liquid allows for good thermal contact between the heat sink 22 and the disc 12 reducing the problem of increased thermal contact resistance during disc 12 distortion found when more solid means of contact, such as solder or physical pressure, are used.
- the fluidity of the high thermal conductivity liquid allows for efficient cooling of the disc 12 even if the shape of the disc distorts under thermal loading.
- the fluidity of the high thermal conductivity liquid in the cavity 14 also avoids putting additional stress into the disc 12 as the liquid conforms to the shape of the disc 12 as the disc 12 thermally expands and contracts.
- the relative sizes of the various layers shown in Fig. 1 are exemplary.
- the heat sink 22 surface area could be the same as that of the disc 12 and the holding body 18.
- ⁇ T Q ( ⁇ x / k A )
- ⁇ T the temperature difference (°C) between surface 16 and surface 24
- Q the heat dissipated (W) from surface 16 to surface 24
- ⁇ x the thickness of the liquid layer (cm)
- k the thermal conductivity of the liquid (W/cm°C)
- A the cross sectional area of the heat flow (cm 2 ).
- the liquid layer thickness ( ⁇ x) must be small and the liquid must have a high thermal conductivity (k).
- Figure 2 shows the laser cooling assembly 10 of Fig. 1 with the heat sink 22 being water cooled. Channels 30 are formed in the heat sink 22 for passing water therethrough to cool the heat sink 22. A seal 20 is situated between the heat sink 22 and the holding body 18 to prevent the high thermal conductivity liquid from leaking through the space between these two bodies.
- FIG. 3 shows a cooling assembly generally indicated at 60 for an end pumped cylindrical rod laser according to an embodiment of the present invention.
- a gain medium 64 is optically pumped through an end 72 and not through a side surface in this embodiment, a heat sink 68 surrounds the gain medium 64 with a thin annular gap 70 between the inner surface of the heat sink 68 and the gain medium 64.
- the gain medium 64 is in thermal contact with the heat sinks 68 via high thermal conductivity liquid contained within the gap 70.
- This liquid is sealed into the cooling assembly 60 via seals 66, such as, for example, O- ring seals.
- FIG 4 shows a cooling assembly generally indicated at 80 according to an embodiment of the present invention for use in a disc type laser system such as the system 10 in Figure 1.
- a solid state laser disc 82 is bonded to a holding body 84 made from a suitable optically transparent material, such as, for example, glass, fused silica or sapphire.
- a fluid holding body 94 is disposed on a side of the disc 82 opposite the holding body 84 to contain high thermal conductivity liquid (e.g. , mercury) used for cooling the disc 82.
- high thermal conductivity liquid e.g. , mercury
- the high thermal conductivity liquid be at least twice as conductive as water to efficiently remove heat from the disc 82.
- the liquid leaves the fluid holding body 94 via an outlet 92.
- the outlet 92 is connected to a heat exchanger and pump 96 that moves the liquid through the cooling assembly 80 and removes heat from the liquid before it returns to the fluid holding body 94.
- Seals 86 are placed around the fluid holding body 94 for keeping the high thermal conductivity liquid within the body 94.
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/783,457 US20020110166A1 (en) | 2001-02-14 | 2001-02-14 | Method and system for cooling a laser gain medium |
US09/783,457 | 2001-02-14 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2002065596A2 true WO2002065596A2 (en) | 2002-08-22 |
WO2002065596A3 WO2002065596A3 (en) | 2002-10-17 |
Family
ID=25129308
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/US2002/001061 WO2002065596A2 (en) | 2001-02-14 | 2002-01-15 | Method and system for cooling a laser gain medium |
Country Status (2)
Country | Link |
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US (1) | US20020110166A1 (en) |
WO (1) | WO2002065596A2 (en) |
Families Citing this family (21)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10204246B4 (en) * | 2002-02-02 | 2012-12-06 | Tesat-Spacecom Gmbh & Co.Kg | Solid-state laser amplifier system |
JP2006186230A (en) * | 2004-12-28 | 2006-07-13 | Osaka Univ | Optical amplifier module, optical amplifier, and laser oscillator |
CN100435434C (en) * | 2005-01-07 | 2008-11-19 | 中国人民解放军国防科学技术大学 | Disk laser |
US7415052B2 (en) * | 2005-04-27 | 2008-08-19 | Honeywell International Inc. | Low stress, high thermal conduction laser rod mounting |
EP1889339A2 (en) * | 2005-06-09 | 2008-02-20 | Honeywell International Inc. | Low stress, high thermal conduction laser rod mounting |
US8514901B2 (en) * | 2010-11-02 | 2013-08-20 | Gerald Ho Kim | Silicon-based cooling package for laser gain medium |
CN102447211A (en) * | 2011-12-02 | 2012-05-09 | 清华大学 | Cooling device of laser grain medium |
WO2015117727A1 (en) * | 2014-02-05 | 2015-08-13 | Pantec Biosolutions Ag | Assembly comprising an amplifying laser material and a cooling unit |
US9762018B2 (en) | 2014-12-09 | 2017-09-12 | Raytheon Company | System and method for cooling a laser gain medium using an ultra-thin liquid thermal optical interface |
US10056731B2 (en) | 2015-11-25 | 2018-08-21 | Raytheon Company | Planar waveguide (PWG) amplifier-based laser system with adaptive optic wavefront correction in low-power beam path |
US11114813B2 (en) | 2015-11-25 | 2021-09-07 | Raytheon Company | Integrated pumplight homogenizer and signal injector for high-power laser system |
US10297968B2 (en) | 2015-11-25 | 2019-05-21 | Raytheon Company | High-gain single planar waveguide (PWG) amplifier laser system |
US10211590B2 (en) | 2015-11-25 | 2019-02-19 | Raytheon Company | Dual-function optical bench and cooling manifold for high-power laser system |
US9865988B2 (en) | 2015-11-25 | 2018-01-09 | Raytheon Company | High-power planar waveguide (PWG) pumphead with modular components for high-power laser system |
US10069270B2 (en) | 2016-02-11 | 2018-09-04 | Raytheon Company | Planar waveguides with enhanced support and/or cooling features for high-power laser systems |
US10411435B2 (en) | 2016-06-06 | 2019-09-10 | Raytheon Company | Dual-axis adaptive optic (AO) system for high-power lasers |
FR3074972B1 (en) * | 2017-12-07 | 2020-10-16 | Commissariat Energie Atomique | ELEMENT OF A DISC LASER CONTAINING THE AMPLIFIER MEDIUM AND IMPROVED COOLING MEANS. |
US10511135B2 (en) | 2017-12-19 | 2019-12-17 | Raytheon Company | Laser system with mechanically-robust monolithic fused planar waveguide (PWG) structure |
US11133639B2 (en) | 2018-07-24 | 2021-09-28 | Raytheon Company | Fast axis thermal lens compensation for a planar amplifier structure |
WO2020059433A1 (en) * | 2018-09-21 | 2020-03-26 | 三星ダイヤモンド工業株式会社 | Optical fiber cooling device and optical fiber laser device |
CN111211466B (en) * | 2018-11-21 | 2022-06-21 | 中国科学院理化技术研究所 | Transparent light guide and low-stress packaged solid laser module device and welding method thereof |
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US4637028A (en) * | 1984-08-02 | 1987-01-13 | Hughes Aircraft Company | Conductively cooled laser rod |
US4852109A (en) * | 1988-12-02 | 1989-07-25 | General Electric Company | Temperature control of a solid state face pumped laser slab by an active siderail |
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FR2641421A1 (en) * | 1989-01-03 | 1990-07-06 | Comp Generale Electricite | PLATE LASER WITH OPTICAL PUMPING BY SOURCE WITH NARROW EMISSION RANGE |
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2001
- 2001-02-14 US US09/783,457 patent/US20020110166A1/en not_active Abandoned
-
2002
- 2002-01-15 WO PCT/US2002/001061 patent/WO2002065596A2/en not_active Application Discontinuation
Patent Citations (7)
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US3895313A (en) * | 1973-09-17 | 1975-07-15 | Entropy Conversion | Laser systems with diamond optical elements |
US4601038A (en) * | 1982-01-18 | 1986-07-15 | Gte Government Systems Corporation | Conduction cooled solid state laser |
US5031184A (en) * | 1989-07-01 | 1991-07-09 | Carl-Zeiss-Stiftung | Cooling arrangement for a semiconductor pump source |
US5546416A (en) * | 1995-04-10 | 1996-08-13 | Northrop Grumman Corporation | Cooling system and mounting for slab lasers and other optical devices |
US5812570A (en) * | 1995-09-29 | 1998-09-22 | Siemens Aktiengesellschaft | Laser diode component with heat sink and method of producing a plurality of laser diode components |
USH1673H (en) * | 1995-12-29 | 1997-08-05 | Hanson; Frank E. | Cooling device for solid state laser |
US5982792A (en) * | 1997-04-21 | 1999-11-09 | Nec Corporation | Solid-state laser device |
Also Published As
Publication number | Publication date |
---|---|
WO2002065596A3 (en) | 2002-10-17 |
US20020110166A1 (en) | 2002-08-15 |
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